A big reason is that the amateur circuit has changed in America. Years ago most American fighters developed as amateur fighters. Alot of the "experieced" amateurs turned pro in America now have in the neighborhood of 50 fights. Some guys turn pro with very little amateur background. Alot of the the European fighters have extensive amateur careers. 200+ fights.
Amateur & pro fighting is different. But the experience of ring time & technique goes a long way.
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